--- old/src/share/classes/java/util/jar/Manifest.java	Mon Mar 12 09:24:02 2012
+++ new/src/share/classes/java/util/jar/Manifest.java	Mon Mar 12 09:24:01 2012
@@ -400,6 +400,8 @@
         public byte peek() throws IOException {
             if (pos == count)
                 fill();
+            if (pos == count)
+                return -1; // nothing left in buffer
             return buf[pos];
         }